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JDBC Type 4 driver for MySQL
/*
* Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, version 2.0, as published by the
* Free Software Foundation.
*
* This program is also distributed with certain software (including but not
* limited to OpenSSL) that is licensed under separate terms, as designated in a
* particular file or component or in included license documentation. The
* authors of MySQL hereby grant you an additional permission to link the
* program and your derivative works with the separately licensed software that
* they have included with MySQL.
*
* Without limiting anything contained in the foregoing, this file, which is
* part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
* version 1.0, a copy of which can be found at
* http://oss.oracle.com/licenses/universal-foss-exception.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License, version 2.0,
* for more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package com.mysql.cj.protocol.x;
import java.util.TimeZone;
import java.util.concurrent.CompletableFuture;
import java.util.function.BiFunction;
import java.util.function.Function;
import java.util.function.Supplier;
import com.google.protobuf.GeneratedMessage;
import com.mysql.cj.exceptions.CJCommunicationsException;
import com.mysql.cj.protocol.ColumnDefinition;
import com.mysql.cj.protocol.MessageListener;
import com.mysql.cj.protocol.ProtocolEntityFactory;
import com.mysql.cj.result.Field;
import com.mysql.cj.result.RowList;
import com.mysql.cj.x.protobuf.Mysqlx.Error;
import com.mysql.cj.x.protobuf.MysqlxResultset.ColumnMetaData;
import com.mysql.cj.xdevapi.SqlDataResult;
import com.mysql.cj.xdevapi.SqlResult;
import com.mysql.cj.xdevapi.SqlUpdateResult;
public class SqlResultMessageListener implements MessageListener {
private static enum ResultType {
UPDATE, DATA
}
private ResultType resultType;
private CompletableFuture resultF;
/**
* Delegate if we get an update result.
*/
private StatementExecuteOkMessageListener okListener;
/**
* Delegate if we get a data result.
*/
private ResultMessageListener resultListener;
private ResultCreatingResultListener resultCreator;
public SqlResultMessageListener(CompletableFuture resultF, ProtocolEntityFactory colToField,
ProtocolEntityFactory noticeFactory, TimeZone defaultTimeZone) {
// compose with non-data future
this.resultF = resultF;
Function, SqlResult>> resultCtor = metadata -> (rows,
task) -> new SqlDataResult(metadata, defaultTimeZone, rows, task);
this.resultCreator = new ResultCreatingResultListener<>(resultCtor, resultF);
this.resultListener = new ResultMessageListener(colToField, noticeFactory, this.resultCreator);
// Propagate the ok packet (or exception) to the result promise
CompletableFuture okF = new CompletableFuture<>();
// hope this doesn't get GC'd
okF.whenComplete((ok, ex) -> {
if (ex != null) {
this.resultF.completeExceptionally(ex);
} else {
this.resultF.complete(new SqlUpdateResult(ok));
}
});
this.okListener = new StatementExecuteOkMessageListener(okF, noticeFactory);
}
public Boolean createFromMessage(XMessage message) {
GeneratedMessage msg = (GeneratedMessage) message.getMessage();
Class msgClass = msg.getClass();
if (this.resultType == null) {
if (ColumnMetaData.class.equals(msgClass)) {
this.resultType = ResultType.DATA;
} else if (!Error.class.equals(msgClass)) {
this.resultType = ResultType.UPDATE;
}
}
if (this.resultType == ResultType.DATA) {
// delegate to the result creation
return this.resultListener.createFromMessage(message);
}
// done
return this.okListener.createFromMessage(message);
}
public void closed() {
this.resultF.completeExceptionally(new CJCommunicationsException("Socket was closed"));
}
public void error(Throwable ex) {
this.resultF.completeExceptionally(ex);
}
}